Computer Shut Off Overnight, Won't Turn Back On

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tristankahler1013

Prominent
Feb 1, 2018
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So the other night my computer shut off when I was asleep and I woke up this morning with nothing. I tried unplugging and plugging back in, holding the power button while there's no power cord to drain all power, trying to jump the ram/cmos with jumper pins on my ASUS z270-a motherboard. I figured since none of that worked, my psu may be dead. But then I saw lights on on my USB hub and also my wifi stick so there has to be power in the system. What confuses me though is if there is power, then the motherboards RGB's should be on, since they stay on in sleep mode and when the system is turned off. I had this happen on my old PC, and I ended up having to take the cmos out and putting it back in, but I can't find a cmos of the ASUS motherboard. I will look it up when I get off work, but I'm still lost as to what it could be, because I don't think a cmos will effect the rgb lights on the mb. Thanks for the help!
 
Solution
Chicano
Most times when the PSU dies it doesn't completely shuts down.. it just doesn't supply enough power for the computer to work... So that's a possibility but BIOS issues resemble faulty PSUs and resetting the BIOS can fix the issue though sometimes the BIOS may need to be restored... so that would be the next step after resetting (clearing) it. Follow the instructions below and if none helps, try a different PSU.


Start with a BIOS reset and if necessary follow with a BIOS Recovery.

Option A) Bios reset:
1. Remove AC power or turn off the PSU
2. Remove the battery
3. Move the BIOS jumper to pins 2 & 3
4. Press and hold the power button for 60 seconds
5. Wait 10 minutes
6. Revert 1 through 3 and try the computer

Option B) Bios...
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Chicano

Chicano

Judicious
Aug 29, 2011
5,071
29
35,490
Most times when the PSU dies it doesn't completely shuts down.. it just doesn't supply enough power for the computer to work... So that's a possibility but BIOS issues resemble faulty PSUs and resetting the BIOS can fix the issue though sometimes the BIOS may need to be restored... so that would be the next step after resetting (clearing) it. Follow the instructions below and if none helps, try a different PSU.


Start with a BIOS reset and if necessary follow with a BIOS Recovery.

Option A) Bios reset:
1. Remove AC power or turn off the PSU
2. Remove the battery
3. Move the BIOS jumper to pins 2 & 3
4. Press and hold the power button for 60 seconds
5. Wait 10 minutes
6. Revert 1 through 3 and try the computer

Option B) Bios recovery:
1. Remove AC power or turn off the PSU
2. Remove the battery
3. Remove the BIOS jumper (only difference from a reset)
4. Press and hold the power button for 60 seconds
5. Wait 10 minutes
6. Revert 1 through 3 and try the computer
 
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Solution
dudio

dudio

Illustrious
Apr 26, 2015
2,534
63
37,240


My first guess is the power supply is done.
Can you please list all your hardware?
The reason I guess the power supply, is that the computer not booting (motherboard requires 12 volts) and the RGB lights not on (they require typically 12 volts) indicate that your PSU crapped out on the 12 volt rail/portion of the supply, and the things that do seem to be working only require the 5 volt portion of the PSU.

*USE THIS* list to see where your current PSU ranks, and what would be a good replacement. Many people here recommend Seasonic as a very reliable supply, or EVGA as a possibly less expensive but still good alternative.

 
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